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ARM: use new LEDS CPU trigger stub to replace old one

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Cc:  Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
This commit is contained in:
Bryan Wu 2012-03-14 02:26:56 +08:00
parent 18775a7bea
commit fa8bbb13ab
6 changed files with 3 additions and 245 deletions
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53
arch/arm/Kconfig
View File

@ -1739,59 +1739,6 @@ config FORCE_MAX_ZONEORDER
This config option is actually maximum order plus one. For example,
a value of 11 means that the largest free memory block is 2^10 pages.
config LEDS
bool "Timer and CPU usage LEDs"
depends on ARCH_CDB89712 || ARCH_EBSA110 || \
ARCH_EBSA285 || ARCH_INTEGRATOR || \
ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
ARCH_AT91 || ARCH_DAVINCI || \
ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
help
If you say Y here, the LEDs on your machine will be used
to provide useful information about your current system status.
If you are compiling a kernel for a NetWinder or EBSA-285, you will
be able to select which LEDs are active using the options below. If
you are compiling a kernel for the EBSA-110 or the LART however, the
red LED will simply flash regularly to indicate that the system is
still functional. It is safe to say Y here if you have a CATS
system, but the driver will do nothing.
config LEDS_TIMER
bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
|| MACH_OMAP_PERSEUS2
depends on LEDS
depends on !GENERIC_CLOCKEVENTS
default y if ARCH_EBSA110
help
If you say Y here, one of the system LEDs (the green one on the
NetWinder, the amber one on the EBSA285, or the red one on the LART)
will flash regularly to indicate that the system is still
operational. This is mainly useful to kernel hackers who are
debugging unstable kernels.
The LART uses the same LED for both Timer LED and CPU usage LED
functions. You may choose to use both, but the Timer LED function
will overrule the CPU usage LED.
config LEDS_CPU
bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
!ARCH_OMAP) \
|| OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
|| MACH_OMAP_PERSEUS2
depends on LEDS
help
If you say Y here, the red LED will be used to give a good real
time indication of CPU usage, by lighting whenever the idle task
is not currently executing.
The LART uses the same LED for both Timer LED and CPU usage LED
functions. You may choose to use both, but the Timer LED function
will overrule the CPU usage LED.
config ALIGNMENT_TRAP
bool
depends on CPU_CP15_MMU

50
arch/arm/include/asm/leds.h
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@ -1,50 +0,0 @@
/*
* arch/arm/include/asm/leds.h
*
* Copyright (C) 1998 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Event-driven interface for LEDs on machines
* Added led_start and led_stop- Alex Holden, 28th Dec 1998.
*/
#ifndef ASM_ARM_LEDS_H
#define ASM_ARM_LEDS_H
typedef enum {
led_idle_start,
led_idle_end,
led_timer,
led_start,
led_stop,
led_claim, /* override idle & timer leds */
led_release, /* restore idle & timer leds */
led_start_timer_mode,
led_stop_timer_mode,
led_green_on,
led_green_off,
led_amber_on,
led_amber_off,
led_red_on,
led_red_off,
led_blue_on,
led_blue_off,
/*
* I want this between led_timer and led_start, but
* someone has decided to export this to user space
*/
led_halted
} led_event_t;
/* Use this routine to handle LEDs */
#ifdef CONFIG_LEDS
extern void (*leds_event)(led_event_t);
#else
#define leds_event(e)
#endif
#endif

1
arch/arm/kernel/Makefile
View File

@ -21,7 +21,6 @@ obj-y := elf.o entry-armv.o entry-common.o irq.o opcodes.o \
obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += compat.o
obj-$(CONFIG_LEDS) += leds.o
obj-$(CONFIG_OC_ETM) += etm.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_ISA_DMA_API) += dma.o

121
arch/arm/kernel/leds.c
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@ -1,121 +0,0 @@
/*
* LED support code, ripped out of arch/arm/kernel/time.c
*
* Copyright (C) 1994-2001 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/export.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/string.h>
#include <asm/leds.h>
static void dummy_leds_event(led_event_t evt)
{
}
void (*leds_event)(led_event_t) = dummy_leds_event;
struct leds_evt_name {
const char name[8];
int on;
int off;
};
static const struct leds_evt_name evt_names[] = {
{ "amber", led_amber_on, led_amber_off },
{ "blue", led_blue_on, led_blue_off },
{ "green", led_green_on, led_green_off },
{ "red", led_red_on, led_red_off },
};
static ssize_t leds_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int ret = -EINVAL, len = strcspn(buf, " ");
if (len > 0 && buf[len] == '\0')
len--;
if (strncmp(buf, "claim", len) == 0) {
leds_event(led_claim);
ret = size;
} else if (strncmp(buf, "release", len) == 0) {
leds_event(led_release);
ret = size;
} else {
int i;
for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
if (strlen(evt_names[i].name) != len ||
strncmp(buf, evt_names[i].name, len) != 0)
continue;
if (strncmp(buf+len, " on", 3) == 0) {
leds_event(evt_names[i].on);
ret = size;
} else if (strncmp(buf+len, " off", 4) == 0) {
leds_event(evt_names[i].off);
ret = size;
}
break;
}
}
return ret;
}
static DEVICE_ATTR(event, 0200, NULL, leds_store);
static struct bus_type leds_subsys = {
.name = "leds",
.dev_name = "leds",
};
static struct device leds_device = {
.id = 0,
.bus = &leds_subsys,
};
static int leds_suspend(void)
{
leds_event(led_stop);
return 0;
}
static void leds_resume(void)
{
leds_event(led_start);
}
static void leds_shutdown(void)
{
leds_event(led_halted);
}
static struct syscore_ops leds_syscore_ops = {
.shutdown = leds_shutdown,
.suspend = leds_suspend,
.resume = leds_resume,
};
static int __init leds_init(void)
{
int ret;
ret = subsys_system_register(&leds_subsys, NULL);
if (ret == 0)
ret = device_register(&leds_device);
if (ret == 0)
ret = device_create_file(&leds_device, &dev_attr_event);
if (ret == 0)
register_syscore_ops(&leds_syscore_ops);
return ret;
}
device_initcall(leds_init);
EXPORT_SYMBOL(leds_event);

6
arch/arm/kernel/process.c
View File

@ -31,9 +31,9 @@
#include <linux/random.h>
#include <linux/hw_breakpoint.h>
#include <linux/cpuidle.h>
#include <linux/leds.h>
#include <asm/cacheflush.h>
#include <asm/leds.h>
#include <asm/processor.h>
#include <asm/thread_notify.h>
#include <asm/stacktrace.h>
@ -189,7 +189,7 @@ void cpu_idle(void)
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
leds_event(led_idle_start);
ledtrig_cpu(CPU_LED_IDLE_START);
while (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
@ -220,7 +220,7 @@ void cpu_idle(void)
} else
local_irq_enable();
}
leds_event(led_idle_end);
ledtrig_cpu(CPU_LED_IDLE_END);
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();

17
arch/arm/kernel/time.c
View File

@ -25,7 +25,6 @@
#include <linux/timer.h>
#include <linux/irq.h>
#include <asm/leds.h>
#include <asm/thread_info.h>
#include <asm/sched_clock.h>
#include <asm/stacktrace.h>
@ -80,21 +79,6 @@ u32 arch_gettimeoffset(void)
}
#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
#ifdef CONFIG_LEDS_TIMER
static inline void do_leds(void)
{
static unsigned int count = HZ/2;
if (--count == 0) {
count = HZ/2;
leds_event(led_timer);
}
}
#else
#define do_leds()
#endif
#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
* Kernel system timer support.
@ -102,7 +86,6 @@ static inline void do_leds(void)
void timer_tick(void)
{
profile_tick(CPU_PROFILING);
do_leds();
xtime_update(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));